Diffusion sheet having self-lubricating particles and diffusion particles, method for fabricating the same, backlight module, and display device

A diffusion sheet comprising:

• a substrate;
• and
• a diffusion layer arranged on a side of the substrate, wherein the diffusion layer comprises a first base layer, and a plurality of diffusion particles distributed in the first base layer and a plurality of self-lubricating particles distributed in the first base layer, the plurality of diffusion particles being different in composition from the plurality of self-lubricating particles;
• wherein:
• a largest particle size among the plurality of self-lubricating particles is equal to a largest particle size among the plurality of diffusion particles, and a smallest particle size among the plurality of self-lubricating particles is equal to a smallest particle size among the plurality of diffusion particles;
• the diffusion sheet further comprises a protective coating arranged on a side of the substrate facing away from the diffusion layer, and the protective coating comprises a second base layer, and a plurality of third diffusion particles distributed in the second base layer;
• and
• a size of the first base layer in a direction perpendicular to a surface of the substrate is one-half to three-fourths of a particle size of a diffusion particle with a largest particle size among the plurality of diffusion particles.